The Source Four LED line is the result of the marriage of the Source Four and Desire product lines yielding the control of a Source Four with color control of the Desire fixture. This ETC Source Four Tungsten LED Light Engine without Lens Tube or Shutter Barrel (Black) - 100-240VAC is comprised of the light engine only. It is intended for those who want to retrofit an existing fixture. There is no shutter barrel on the engine. It is compatible with zoom lens barrels only and requires one for use.

Among the many benefits of the light engine are multiple control options via DMX, superior color rendition, multi-voltage operation and long (50,000 hour) lamp life.